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Stackoverflow is one of most widely used Q&A platform. It is the default choice of developers. It has over 100 million page views in a month and its Google page rank is 60. Check out its open source technology stack, the tools used to build such a popular website. Stackoverflow uses open source projects and also contributes to it.

Uber, a taxi aggregation platform operates around the globe. It was started as monolith application and later re-architected as bunch of microservices, which gives them scalability. Uber uses lot of open source tools and they have contributed quite a lot projects back to the community. This article is about analyzing Uber's open source technology stack.

Git is a fast, scalable, distributed revision control system originally written by Linus
Torvalds. Git Server is initially written for Linux and later ported to Windows, Solaris and Mac. This article provides pointers to various Git server , Git clients, plugin and code review tools for Windows. It will be a Git complete solution stack for Windows.

Tumblr is a microblogging platform that allows users to effortlessly share anything. Tumblr now hosts over 70 million blogs with over 34 billion posts to date. Below is the list of open source used in Tumbler.

Zimbra is a Enterprise messaging and collaboration software. It is a good alternative to Microsoft Exchange server. Zimbra is a Email Server but they have not written anything related to SMTP server, rather they have integrated well know open source email server in to its package. Zimbra is a system of well connected / integrated multiple open source software which delivers enterprise quality to it. This article explains most important components which helps to build the enterprise product.

Pinterest is a tool for collecting and organizing things you love. It is a social networking site
where users could pin images and write a note for that. It is now currently serving billions of pages every month. Check out the open source products used in Pinterest.